@import url('https://fonts.googleapis.com/css2?family=Figtree:wght@300;400;500;600;700&family=Noto+Sans:wght@300;400;500;700&display=swap');

/* =====================
   CSS自定义属性
   ===================== */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-gray-800: #222222;
  --radius-card: 28px;
  --radius-pill: 999px;
  --radius-sm: 8px;
  --font-main: 'Figtree', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --space-12: 96px;
  --nav-h: 64px;
  --grid-cols: 12;
  --grid-gap: 1rem;
  --max-w: 1200px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =====================
   Reset
   ===================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: 17px;
  line-height: 1.65;
  color: var(--c-black);
  background: var(--c-white);
  min-height: 100vh;
  overflow-x: hidden;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ol, ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* =====================
   页面包装
   ===================== */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* =====================
   顶部导航
   ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-black);
  border-bottom: 2px solid var(--c-white);
  height: var(--nav-h);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
  height: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-2);
}

.header-left {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: center;
}

.brand-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* 导航：nav > ol > li > a */
.site-nav {
  overflow: hidden;
}

.site-nav ol {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  justify-content: center;
  flex-wrap: wrap;
}

.site-nav ol li a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 var(--space-2);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-white);
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  transition: border-color var(--transition), background var(--transition);
  white-space: nowrap;
}

.site-nav ol li a:hover,
.site-nav ol li a[aria-current="page"] {
  border-color: var(--c-white);
  background: rgba(255,255,255,0.08);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* =====================
   Hero 通用
   ===================== */
.hero-section,
.review-hero,
.compare-banner,
.ranking-banner,
.faq-banner,
.about-banner,
.privacy-banner {
  position: relative;
  background: var(--c-black);
  color: var(--c-white);
  min-height: 45vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
}

.hero-clip {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--c-white);
  clip-path: polygon(0 100%, 100% 100%, 100% 0);
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--c-white);
  color: var(--c-black);
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-2);
}

/* =====================
   首页 Hero
   ===================== */
.hero-inner {
  position: relative;
  z-index: 3;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8) var(--space-3) calc(var(--space-8) + 60px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.6;
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-4);
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.hero-media {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
}

.hero-img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* =====================
   子页 Banner
   ===================== */
.review-hero-inner,
.compare-banner-inner,
.ranking-banner-inner,
.faq-banner-inner,
.about-banner-inner,
.privacy-banner-inner {
  position: relative;
  z-index: 3;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8) var(--space-3) calc(var(--space-6) + 60px);
}

.review-h1,
.compare-h1,
.ranking-h1,
.faq-h1,
.about-h1,
.privacy-h1 {
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.compare-desc,
.ranking-desc,
.faq-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  margin-top: var(--space-1);
  max-width: 600px;
}

.review-meta,
.compare-meta,
.ranking-meta,
.privacy-meta {
  margin-top: var(--space-2);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.review-hero-img {
  margin-top: var(--space-3);
  border-radius: var(--radius-card);
  overflow: hidden;
  max-width: 600px;
}

/* =====================
   按钮
   ===================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 var(--space-4);
  font-size: 15px;
  font-weight: 600;
  background: var(--c-white);
  color: var(--c-black);
  border-radius: var(--radius-pill);
  border: 2px solid var(--c-white);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--c-gray-100);
  transform: translateY(-2px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 var(--space-4);
  font-size: 15px;
  font-weight: 600;
  background: transparent;
  color: var(--c-white);
  border-radius: var(--radius-pill);
  border: 2px solid var(--c-white);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-2px);
}

/* =====================
   主内容区 & 网格
   ===================== */
.page-main {
  flex: 1;
  padding: var(--space-8) 0;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* main > section.wrap > div > article 四层 */
.content-section {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-6);
  align-items: start;
}

.content-article {
  min-width: 0;
}

/* =====================
   文章内容
   ===================== */
.article-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--c-black);
}

.page-h1 {
  font-size: clamp(24px, 3.5vw, 38px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.article-meta {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-date {
  font-size: 13px;
  color: var(--c-gray-600);
  font-weight: 400;
}

.article-body {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-gray-800);
}

.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  margin: var(--space-6) 0 var(--space-2);
  letter-spacing: -0.01em;
  color: var(--c-black);
}

.article-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin: var(--space-4) 0 var(--space-2);
  color: var(--c-black);
}

.article-body p {
  margin-bottom: var(--space-3);
}

.article-body ul,
.article-body ol {
  margin: var(--space-2) 0 var(--space-3) var(--space-3);
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: var(--space-1);
}

.article-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}

.article-body a:hover {
  opacity: 0.7;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 15px;
}

.article-body th,
.article-body td {
  padding: var(--space-2) var(--space-2);
  border: 1.5px solid var(--c-gray-200);
  text-align: left;
}

.article-body th {
  background: var(--c-black);
  color: var(--c-white);
  font-weight: 600;
}

.article-body blockquote {
  border-left: 4px solid var(--c-black);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-4) 0;
  background: var(--c-gray-100);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}

/* =====================
   侧边栏
   ===================== */
.sidebar {
  position: sticky;
  top: calc(var(--nav-h) + var(--space-3));
}

.sidebar-block {
  background: var(--c-gray-100);
  border-radius: var(--radius-card);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
  border-bottom: 3px solid var(--c-black);
}

.sidebar-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  color: var(--c-black);
}

.sidebar-links li {
  border-bottom: 1px solid var(--c-gray-200);
}

.sidebar-links li:last-child {
  border-bottom: none;
}

.sidebar-links a {
  display: block;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-gray-800);
  transition: color var(--transition), padding-left var(--transition);
}

.sidebar-links a:hover {
  color: var(--c-black);
  padding-left: 6px;
}

.sidebar-note {
  font-size: 14px;
  color: var(--c-gray-600);
  line-height: 1.6;
}

/* =====================
   卡片 — 底部强调线 + 圆角28px
   ===================== */
.card {
  background: var(--c-white);
  border: 1.5px solid var(--c-gray-200);
  border-radius: var(--radius-card);
  border-bottom: 4px solid var(--c-black);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

.card-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-gray-200);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.card-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--c-black);
  color: var(--c-white);
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 4px;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
}

.card-title a:hover {
  opacity: 0.7;
}

.card-desc {
  font-size: 14px;
  color: var(--c-gray-600);
  line-height: 1.6;
}

.card-date {
  font-size: 12px;
  color: var(--c-gray-400);
}

.card-foot {
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: 1px solid var(--c-gray-200);
}

.card-cta {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--space-2);
  font-size: 13px;
  font-weight: 600;
  background: var(--c-black);
  color: var(--c-white);
  border-radius: var(--radius-pill);
  transition: opacity var(--transition);
}

.card-cta:hover {
  opacity: 0.75;
}

/* =====================
   首页评测栅格
   ===================== */
.reviews-section,
.features-section {
  margin-top: var(--space-8);
}

.reviews-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.reviews-section .review-card {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3);
}

.reviews-section .review-card .card-foot {
  border: none;
  padding: 0;
  margin: 0;
}

.section-h2 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
  grid-column: 1 / -1;
}

.section-sub {
  font-size: 15px;
  color: var(--c-gray-600);
  margin-bottom: var(--space-4);
  grid-column: 1 / -1;
}

.features-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.feature-card {
  grid-column: auto;
}

/* =====================
   首页正文区
   ===================== */
.home-main .content-section {
  margin-bottom: var(--space-4);
}

.home-intro .article-body {
  font-size: 16px;
}

/* =====================
   评测页
   ===================== */
.review-footer-links {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 2px solid var(--c-black);
}

.back-link {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 var(--space-2);
  font-size: 14px;
  font-weight: 600;
  border: 1.5px solid var(--c-black);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
}

.back-link:hover {
  background: var(--c-black);
  color: var(--c-white);
}

/* =====================
   对比页
   ===================== */
.compare-cta-row {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 2px solid var(--c-black);
  flex-wrap: wrap;
}

/* =====================
   榜单页
   ===================== */
.rank-list-section {
  margin-top: var(--space-8);
}

.rank-item {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  border: 1.5px solid var(--c-gray-200);
  border-radius: var(--radius-card);
  border-bottom: 4px solid var(--c-black);
  margin-bottom: var(--space-2);
  transition: transform var(--transition);
}

.rank-item:hover {
  transform: translateX(4px);
}

.rank-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--c-gray-200);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-align: center;
}

.rank-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.rank-title a:hover {
  opacity: 0.7;
}

.rank-desc {
  font-size: 13px;
  color: var(--c-gray-600);
}

.rank-arrow {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--space-2);
  font-size: 13px;
  font-weight: 600;
  background: var(--c-black);
  color: var(--c-white);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: opacity var(--transition);
}

.rank-arrow:hover {
  opacity: 0.75;
}

/* =====================
   FAQ 专用样式
   ===================== */
.faq-body {
  /* details/summary 样式 */
}

.faq-body details {
  border: 1.5px solid var(--c-gray-200);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
  overflow: hidden;
}

.faq-body summary {
  padding: var(--space-2) var(--space-3);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  background: var(--c-gray-100);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition);
}

.faq-body summary:hover {
  background: var(--c-gray-200);
}

.faq-body details[open] summary {
  border-bottom: 1.5px solid var(--c-gray-200);
}

.faq-body details > *:not(summary) {
  padding: var(--space-3);
}

.faq-nav-links {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 2px solid var(--c-black);
}

/* =====================
   About 页
   ===================== */
.about-links {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 2px solid var(--c-black);
}

.about-link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.about-link-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: var(--space-2);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  border: 1.5px solid var(--c-gray-200);
  border-radius: var(--radius-card);
  border-bottom: 3px solid var(--c-black);
  transition: background var(--transition), transform var(--transition);
}

.about-link-card:hover {
  background: var(--c-black);
  color: var(--c-white);
  transform: translateY(-2px);
}

.about-links .section-h2 {
  grid-column: auto;
}

.privacy-back {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 2px solid var(--c-black);
}

/* =====================
   页脚
   ===================== */
.site-footer {
  background: var(--c-black);
  color: var(--c-white);
  padding: var(--space-4) 0;
  margin-top: auto;
}

/* footer 直接子层有分区容器 */
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: space-between;
}

.footer-brand {
  flex-shrink: 0;
}

.footer-logo-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-white);
  white-space: nowrap;
}

/* footer nav */
.footer-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.footer-nav ol li a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.footer-nav ol li a:hover {
  color: var(--c-white);
  border-color: rgba(255,255,255,0.3);
}

.footer-copy {
  text-align: center;
  width: 100%;
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: var(--space-2);
}

.footer-copy p {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  line-height: 1.6;
}

/* =====================
   subtitle 通用（契约：h2 + p.subtitle）
   ===================== */
.subtitle {
  line-height: 1.6;
}

/* =====================
   日期标签
   ===================== */
time.card-date,
time.page-date {
  display: inline-block;
}

/* =====================
   Parallax & Micro-animations
   ===================== */
@media (prefers-reduced-motion: no-preference) {
  .card {
    will-change: transform;
  }

  .rank-item {
    will-change: transform;
  }

  .hero-section {
    background-attachment: fixed;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* =====================
   移动端响应式
   ===================== */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding-bottom: calc(var(--space-6) + 60px);
  }

  .hero-media {
    display: none;
  }

  .content-section {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
  }

  .sidebar-block {
    margin-bottom: 0;
  }

  .features-section {
    grid-template-columns: 1fr;
  }

  .about-link-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  :root {
    --nav-h: 56px;
  }

  body {
    font-size: 16px;
  }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--c-black);
    border-bottom: 2px solid rgba(255,255,255,0.2);
    padding: var(--space-2);
    z-index: 99;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ol {
    flex-direction: column;
    gap: 4px;
  }

  .site-nav ol li a {
    width: 100%;
    justify-content: flex-start;
    height: 48px;
    font-size: 15px;
  }

  .nav-toggle {
    display: flex;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .reviews-section .review-card {
    grid-template-columns: 40px 1fr;
    grid-template-rows: auto auto;
  }

  .reviews-section .review-card .card-foot {
    grid-column: 1 / -1;
    padding-top: var(--space-1);
    border-top: 1px solid var(--c-gray-200);
    margin-top: var(--space-1);
  }

  .rank-item {
    grid-template-columns: 44px 1fr;
    grid-template-rows: auto auto;
  }

  .rank-arrow {
    grid-column: 1 / -1;
    width: fit-content;
  }

  .hero-h1 {
    font-size: 26px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .footer-nav ol {
    gap: 4px;
  }

  .about-link-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    grid-template-columns: 1fr;
  }

  .compare-cta-row,
  .review-footer-links,
  .faq-nav-links,
  .privacy-back {
    flex-wrap: wrap;
  }

  .btn-primary,
  .btn-ghost {
    height: 44px;
    width: 100%;
    justify-content: center;
  }

  .page-main {
    padding: var(--space-6) 0;
  }

  .page-h1 {
    font-size: 24px;
  }
}

/* =====================
   Nav toggle JS 支持
   ===================== */
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}